Tim x biet : (x+2)+(x+4)+.....+(x+52)=698
tim x 52x-3-2×52 = 52×3
tim x 52x_3-2×52 = 52×3
a, 2.x+3.x=57÷55
B, 5.(7.x - 45) = 23 .52 - 32 . 20
So sánh :
a= 2 / 60 x 63 + 2 / 63 x 66 + 2 / 66 x 69 + ........... + 2 / 117 x 120 + 2 / 2011
và b= 5 / 40x 44 + 5 / 44 x 48 + 5 / 48 x 52 + ......... + 5 / 76 x 80 + 5 / 2011
tim x y z biet
x/12=y/9=z/5 va x+y+z=52
7^x + 135 : 45 = 52
x -56 : 4= 16
101 +(36 –4x) =105
2(x-51) = 2.23+ 20
10 -(x –3): 2 = 72–110
2x –49 = 5.32
[(8x -12) : 4].33= 36
52x –3–2 . 52= 52. 3
(x3–7) : 4 = 5
a, [(6.x - 39) :3] .28 =5628
B, 5.(7.x- 45) = 23 . 52 - 32.20
Giúp tớ nhanh vs aj